Here, let me dumb it down for you, oh sarcastic one.Here let me dumb it down
Student has straight A’s for 10 years then on his last report card he gets to Ds - what is his history and what is his recent history
Does that help you understand the difference between history and recent history??
If the student in question had a traumatic brain injury between the A's and D's, it could be a sign that regression to the mean is unlikely.